package router

import (
	"bytes"
	"io/fs"
	"net/http"
	"path"
	"time"

	"github.com/gorilla/mux"
)

// FileHandler handles loading file assets
func (re *Router) FileHandler(ph string) HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) error {
		filename := mux.Vars(r)["filename"]
		file, err := fs.ReadFile(re.fsys, "assets/"+ph+"/"+filename)
		if err != nil {
			return HTTPError(http.StatusNotFound, err)
		}
		switch p := path.Ext(filename); p {
		case ".css":
			w.Header().Set("Content-Type", "text/css")
		case ".js":
			w.Header().Set("Content-Type", "application/javascript")
		case ".json":
			w.Header().Set("Content-Type", "application/json")
		case ".svg":
			w.Header().Set("Content-Type", "image/svg+xml")
		default:
			w.Header().Set("Content-Type", http.DetectContentType(file))
		}
		w.Header().Set("Cache-Control", "max-age=2592000")
		http.ServeContent(w, r, filename, time.Now(), bytes.NewReader(file))
		return nil
	}
}